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PA Consulting Business Combination - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 02, 2021
Jul. 02, 2021
Oct. 01, 2021
Oct. 02, 2020
Sep. 27, 2019
Business Acquisition [Line Items]          
Pre-tax transaction costs     $ 36,800    
Preferred redeemable noncontrolling interests redemption value adjustment   $ 57,300 57,307 $ 0 $ 0
Preference share effect on basic earnings per share (in dollars per share)   $ 0.44      
PA Consulting Employees          
Business Acquisition [Line Items]          
Ownership interest of employees 35.00%        
PA Consulting Group Limited          
Business Acquisition [Line Items]          
Percentage of outstanding shares of common and preferred stock acquired 65.00%        
Consideration transferred $ 1,700,000        
Consideration received from acquiree 261,000        
Fair value of redeemable noncontrolling interests at acquisition $ 582,400        
Cash in employee benefit trust     $ 12,300    
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life 12 years        
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life 9 years        
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum          
Business Acquisition [Line Items]          
Acquired finite-lived intangible assets, weighted average useful life 20 years